فُتِحَتِ النَّافِذَةُ — The window was opened.
النَّافِذَةُ: passive subject, nominative; grammatically but not biologically feminine. The feminine-marked verb is a standard form.
The permissibility of alternative agreement can depend on whether the noun is genuinely or figuratively feminine and on syntactic separation; do not force one absolute rule on all feminine nouns.
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Mafʿūl Mā Lam Yusamma Fāʿiluhu — The Passive Subject
فُتِحَتِ النَّافِذَةُ — The window was opened.
النَّافِذَةُ: passive subject, nominative; grammatically but not biologically feminine. The feminine-marked verb is a standard form.
The permissibility of alternative agreement can depend on whether the noun is genuinely or figuratively feminine and on syntactic separation; do not force one absolute rule on all feminine nouns.